focus on space exploration, manned space exploration, and i teamed up with senator bill nelson from florida, and we crafted a compromise that allowed commercial crew vehicles to go forward but not at the expense of the next generation of space flight. and you saw an excitement in space. >> touchdown, confirmed. we're safe on mars! >> for the first time in years when that rover landed on mars at precisely the place it was supposed to land after being in the air for six months and i thought, yes, we've done something that is really important in the big sense. >> what will you most miss. let's say you like many of your colleagues and you'll miss them, but what about the place will you miss? >> the chance to affect public policy in ways that are important to me. that's the reason i do this. i think that's the reason all of us do it. also i think the public vastly underestimates the legitimacy of the motives of the people who are here. >> that's correct. >> and the major motivating factor is what we think is right. i have some strong views about how to make this country, which is both fairer and